Finite-temperature scaling of quantum coherence near criticality in a spin chain

被引：4

作者：

Cheng, Weiwen ^{[1
,2
]}

Zhang, Zhijun ^{[1
]}

Gong, Longyan ^{[1
]}

Zhao, Shengmei ^{[1
]}

机构：

[1] Nanjing Univ Posts & Telecommun, Inst Signal Proc & Transmiss, Nanjing 210003, Jiangsu, Peoples R China

[2] Hubei Normal Univ, Dept Phys, Huangshi 435002, Peoples R China

来源：

EUROPEAN PHYSICAL JOURNAL B | 2016年 / 89卷 / 06期

关键词：

YANASE SKEW INFORMATION; PHASE-TRANSITION; CRITICAL-POINT; ENTANGLEMENT; FACTORIZATION; MODEL;

D O I：

10.1140/epjb/e2016-70042-6

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We explore quantum coherence, inherited from Wigner-Yanase skew information, to analyze quantum criticality in the anisotropic XY chain model at finite temperature. Based on the exact solutions of the Hamiltonian, the quantum coherence contained in a nearest-neighbor spin pairs reduced density matrix p is obtained. The first -order derivative of the quantum coherence is non-analytic around the critical point at sufficient low temperature. The finite-temperature scaling behavior and the universality are verified numerically. In particular, the quantum coherence can also detect the factorization transition in such a model at sufficient low temperature. We also show that quantum coherence contained in distant spin pairs can characterize quantum criticality and factorization phenomena at finite temperature. Our results imply that quantum coherence can serve as an efficient indicator of quantum criticality in such a model and shed considerable light on the relationships between quantum phase transitions and quantum information theory at finite temperature.

引用

页数：6

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